Propeller.



A. C DE LOS RIOS.

PROPELLBR.

APPLICATION FILED MAY 11, 1911. M 1 .031,629. Patented JulyT 2,1912.

rs arena Fre@ ALONSO CARDOSO DE Los RIOS, OF HABANA, CUBA.

PROPELLER.

To allan/wm t may conce/m Be 1t known that I, ALoNso CAnDoso Dn LosRios, a subject of the King of Spain,

vides an increased driving surface over the ordinary propeller,'by meansof which negative slip can bemininuzed, which may be oi any desiredpitch, measured both radially and longitudinally, which may beofsectional form to facilitate repair and replacement, and which may befashioned from any suitable material. u

The invention consists in the construction and combination of parts tobe more fully described hereinafter and particularly set forth. in theclaims. n

,Reference is to be had to the accompanying drawings `forming a part ofthis specific-ation, in which similar characters of reference indicatecorresponding parts in all the views, and in which- Figure l is 'a sideelevation of an embodiment of my invention; Fig.2 is a longitudinalsection of the propeller; `and Fig. 3 is a transverse section on theline 3-3 of Fig.- 2.

Before proceeding to amore detailed explanation of my invention, itshould be clearly understood that while the same is particularly usefulas apropeller for marine propulsion, it can also be advantageouslyapplied to other uses, for example, as a propeller for aeroplanes orother types of airships. If so desired, the device -can also be adaptedfor different purposes in which screw blades are employed, for examplein connection with air-forcing mechanism or the like.

Certain of the details\o.t construction shown for example herewith, formno part of the invention, and can be varied in accordance withindividual preference and Specification of Letters Patent.

Application filed May 11, 1911. Serial No. 626,469.

Patented July 2, 19t 2.

special conditions, without deviating from theessence of the inventionas defined in the appended claims.

Referring moreparticularly to the drawings, I have shown for example, ashaft 9 'of conventional form, upon which the propeller is mounted. Thepropeller illustrat-ed herewith is formed in three sections A, B and C,which have hollow hubs 10, 1l and l2 respectively, of elongated, taperedform. The hubs 10 and Il at correspondand 14 adapted to be received inthecorrespondingly threaded ends of the respective sections 11 and 12,to assemble the sections and to form a continuous, elongated, taperedhub. At the opposite ends, the sections 1() and 12 are internallythreaded, and receive respectively, reduced, threaded parts of heads 15Aand 16, of suitable form. The heads engage the annularY end edges ofthe sections 10 and 12 and are provided with 'openings 17 and 18 throughwhich the shaft 9 extends.

The propeller has blades of tapered, helic al form. helical surfaces ofany suitable pitchand if desired, of varying pitch, and of varyingradius. The blades are sectional, and each oit' the sections A, B and Chas corresponding blade sections 19, 2O and 21 associated therewith.rlVhile I have shown for eXample herewith blade and hub sections formedintegral, the blade sections may be associated removably in any suitablemanner with the hubs, if s0 desired.

I prefer touse three as illustrated. The sections of the propeller areso assembled that the respective blade sections register, so'that theblades are continuous from one end of the hub to the other. I prefer toeX- tend the ends of the blade sections 19 and 21 longitudinally beyondthe corresponding ends of the hub sections 10 and 12, as is clearlyshown in Fig. l. These ends are preferably rounded.

It will be understood that certain of the considerations which apply toordinary propellers also apply to my propeller. For example,considerations of dierent pitch, blade area,` driving surface, bladeedge form, and materials of construction. As is shown That is to say,the blades have,

Any suitable number of blades may be employed, thoughlingends havereduced, threaded necks 13,

herewith, I prefer to employ blades in which 1w' the longitudinal pitchdecreasesitowardgthe smaller lend of the' hub. Owing to the, ta-

i0 tain of said pered form ot the blades the line of the'free edge ofeach blade is substantially a conical spiral.

Having 5 claim as new, ters Patent:

1. A' propeller, comprising a plurality ot sections, tapered hub and ahelical blade section, cerr hub sections having threaded engagement, andheads having threaded en gagement with the end hub sections, the linesof the free edges of said blades being substantially conical spirals.

thus described my invention, 4lf and desire to secure by i5 f 2. Apropeller comprising a plurality of" Let-l eaeh consistingv of an-elongated,.

sections-each consist-ing of an elongated, tapered hub and a helicalblade section, one of said hub sections having a reduced,

threaded end, the other of said hub sections being interiorly threadedto receive said re- 20 of tvvo subscribing Witnesses.

itoNso clavos() mi Los Rios.

Witnesses:

C. STEWART ONEILL, RAOUL WASHINGTON.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Tatents.

Washington, D. C.

